Rainbow Electronics ATmega8HVD - Manual (Page 135)

135
8052B–AVR–09/08
ATmega4HVD/8HVD
Figure 24-2. Serial Programming Instruction example
24.7 High-voltage Serial Programming
This section describes how to program and verify Flash Program memory, EEPROM Data
memory, Lock bits and Fuse bits in the ATmega4HVD/8HVD.
The prog_enable minimum period for the Serial Clock Input (SCI) during High-voltage Serial
Programming is 220 ns.
Byte 1 Byte 2 Byte 3 Byte 4
Adr LSB
Bit 15 B 0
Serial Programming Instruction
Program Memory/
EEPROM Memory
Page 0
Page 1
Page 2
Page N-1
Page Buffer
Write Program Memory Page/
Write EEPROM Memory Page Load Program Memory Page (High/Low Byte)/
Load EEPROM Memory Page (page access)
Byte 1 Byte 2 Byte 3 Byte 4
Bit 15 B 0
Adr MSB
Page Offset
Page Number
Adr M MS SB A A Adrr L LSB B
Table 24-11. Pin Name Mapping
Signal Name in High-voltage
Serial Programming Mode
Pin Name I/O Function
SDO PB1 O Serial Data Output
SDI PC1 I Serial Data Input
SII PB0 I Serial Instruction Input
SCI PC0 I Serial Clock Input (min. 220ns period)
Table 24-12. Pin Values Used to Enter Programming Mode
Symbol Pin Name Value
Prog_enable[0] PB0 0
Prog_enable[1] PB1 0
Prog_enable[2] NC 0
Prog_enable[3] PB2 0